Thuridilla vataae

Thuridilla vataae is a small, slender sea slug that reaches a maximum length of about 2 cm. Its purplish head features a distinctive white Y-shaped mark and large coiled rhinophores tipped with orange-red. The parapodia, which are long and fold over the back, typically display a bluish-violet to dark grey coloration with patches of creamy yellow and black spots. This species is found in the tropical and subtropical Indo-Pacific, inhabiting shallow water reefs and lagoons, with a depth range usually not exceeding 1 meter. Its distribution spans from South Africa to Japan, the Philippines, Northern Australia, and Vanuatu. Encountering this sea slug while diving can be intriguing, as it often blends into its surroundings due to its coloration and mimicry of other nudibranchs, which may deter potential predators.  Feeding primarily on algae, Thuridilla vataae uses its specialized radula to cut and rasp the cell walls of its food source. This species is a simultaneous hermaphrodite, allowing individuals to mate with each other and exchange sperm. After fertilization, they lay a gelatinous string of orange eggs in a spiral formation. The larvae hatch after about five days and are likely planktonic before settling on the seabed to undergo metamorphosis into juveniles. This species has not been evaluated for conservation status, and there is no information regarding its commonness in the wild.